Read the rules of a graph first: work out what one space or one picture stands for, then read the values.
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Data and Graphs: Reading Scales
Methods in this video
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- 1
Labelled scale: subtract, then divide by the spaces
When to use it: A scale or graph axis has number labels, but the target is on an unlabelled or half division. You need the value of one space to read it correctly.
- Subtract two labels on the same scale and divide by the small spaces between them. Count spaces, not tick marks.
- Read from a known label in the right direction. Split big divisions and keep half divisions. The left end need not be zero.
- Check the axis and units. Follow the grid to read values. For a given height, find every crossing of the curve.
Practise exam-style questions with these methods
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